Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  linux/lib/kasprintf.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <stdarg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /* Simplified asprintf. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	unsigned int first, second;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	va_list aq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	va_copy(aq, ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	first = vsnprintf(NULL, 0, fmt, aq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	va_end(aq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	p = kmalloc_track_caller(first+1, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	second = vsnprintf(p, first+1, fmt, ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	     first, second, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) EXPORT_SYMBOL(kvasprintf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  * (or the sole vararg) points to rodata, we will then save a memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  * allocation and string copy. In any case, the return value should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  * freed using kfree_const().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	if (!strchr(fmt, '%'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		return kstrdup_const(fmt, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	if (!strcmp(fmt, "%s"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		return kstrdup_const(va_arg(ap, const char*), gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return kvasprintf(gfp, fmt, ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) EXPORT_SYMBOL(kvasprintf_const);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) char *kasprintf(gfp_t gfp, const char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	va_list ap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	va_start(ap, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	p = kvasprintf(gfp, fmt, ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	va_end(ap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) EXPORT_SYMBOL(kasprintf);